com.jingtum.core.bouncycastle.asn1.DERUTF8String Maven / Gradle / Ivy

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/*
 * Copyright www.jingtum.com Inc. 
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package com.jingtum.core.bouncycastle.asn1;

import java.io.IOException;

import com.jingtum.core.bouncycastle.util.Arrays;
import com.jingtum.core.bouncycastle.util.Strings;

/**
 * DER UTF8String object.
 */
public class DERUTF8String
    extends ASN1Primitive
    implements ASN1String
{
    private byte[]  string;

    /**
     * return an UTF8 string from the passed in object.
     * 
     * @exception IllegalArgumentException
     *                if the object cannot be converted.
     */
    public static DERUTF8String getInstance(Object obj)
    {
        if (obj == null || obj instanceof DERUTF8String)
        {
            return (DERUTF8String)obj;
        }

        if (obj instanceof byte[])
        {
            try
            {
                return (DERUTF8String)fromByteArray((byte[])obj);
            }
            catch (Exception e)
            {
                throw new IllegalArgumentException("encoding error in getInstance: " + e.toString());
            }
        }

        throw new IllegalArgumentException("illegal object in getInstance: "
                + obj.getClass().getName());
    }

    /**
     * return an UTF8 String from a tagged object.
     * 
     * @param obj
     *            the tagged object holding the object we want
     * @param explicit
     *            true if the object is meant to be explicitly tagged false
     *            otherwise.
     * @exception IllegalArgumentException
     *                if the tagged object cannot be converted.
     */
    public static DERUTF8String getInstance(
        ASN1TaggedObject obj,
        boolean explicit)
    {
        ASN1Primitive o = obj.getObject();

        if (explicit || o instanceof DERUTF8String)
        {
            return getInstance(o);
        }
        else
        {
            return new DERUTF8String(ASN1OctetString.getInstance(o).getOctets());
        }
    }

    /**
     * basic constructor - byte encoded string.
     */
    DERUTF8String(byte[] string)
    {
        this.string = string;
    }

    /**
     * basic constructor
     */
    public DERUTF8String(String string)
    {
        this.string = Strings.toUTF8ByteArray(string);
    }

    public String getString()
    {
        return Strings.fromUTF8ByteArray(string);
    }

    public String toString()
    {
        return getString();
    }

    public int hashCode()
    {
        return Arrays.hashCode(string);
    }

    boolean asn1Equals(ASN1Primitive o)
    {
        if (!(o instanceof DERUTF8String))
        {
            return false;
        }

        DERUTF8String s = (DERUTF8String)o;

        return Arrays.areEqual(string, s.string);
    }

    boolean isConstructed()
    {
        return false;
    }

    int encodedLength()
        throws IOException
    {
        return 1 + StreamUtil.calculateBodyLength(string.length) + string.length;
    }

    void encode(ASN1OutputStream out)
        throws IOException
    {
        out.writeEncoded(BERTags.UTF8_STRING, string);
    }
}